Multistage steam-jet ejector



June 16, 1931.

' MULTISTAGE STEAM JET EJECTOR Filed April 12. 1930 Mae-47v. 77166 Sim,

SIM 1,810,873

Patented June 16, 1931 UNITED} "stares PFATENTLOFFILZCQE JAMES snvr, or. GiLAsGow, scoTLAivi), nssrenon r0 G. a J. WEIR, LI ITED, on

GL-As'Gow, SCOTLAND MULTIsrA 'n s'rEAM-Jn'r mama Application fi'ieaapjni 12, 1930, Serial No; 443,837, and in Great Britain May 16, 1529;

The present invention relates to multistage steam-jet ejectors, for example, to the :ejectors'used to discharge the an from the "main condensers in steam power plants. f5 When, in "a steam-power plant, a twostage steam-jet ejector employed for discharging the air from the maincondenser is provided with'an inter-condenser .of the sur facetype in which the cooling or condensing 0 water is condensate from the main condenser, the heat in the operating steam of the first stage is conserved. W By replacing the surfacecondenser (i. .e. the inter-condenser) by a condenser offthe 25 directecontact type, the air-handling capacity of' the (two-stage) ejector is substantially increased, but the heat in the operating steam of the first stage is lost. i V

The object of the present invention is to "2t reduce this heat loss while retaining the airhandling advantage.

This object is attained by the present 1nvention. The invention 'willbe defined 1n the annexed claims but it may here be said 25 to consist generally in employing for intercondensing a surface condenser and a directcontact condenser, the two being arranged in series with the surface condenser nearest to the first-stage steam-jet, and the cooling- :46 surface and direct-contact condenser, while the combination condenser arrangement avoids the excessive heat loss associated with the use of a direct-contact condenser only.

The accompanying drawing-which is diagrammatic-illustrates the carrying of the invention into eflect in one convenient manner as applied to a two-stage ejector employed to discharge the air from the main 5'6 condenser in a steam power plant;

the chamber e'is arranged to fiow back,

[a is thesteam-jet nozzle and lithe combining'nozzle and diffuser of the first stage. 0 is the steam nozzle and d the combining nozzle an'ddilfuse'r of the second "stage. The

discharge from the first stage. is passed 5 7 through the surface condenser f.' Thesteam and uncondensed vapour therefrompass into. thecliamber e ,of' the direct contact condenser. This chamber is of considerable height with respect to its lateral dimensions. '61

'72, is a water pipe bringing fcondensate from the rnain condenser. This pipe is branched. The ore branch 1e takes'the water to the surface condenser f where it'is employed as the cooling orcondensing water, while the other branch at leads the water to the water-receiving and" delivery chamber o'f'the direct-contact condenser.

The water is discharged into'the-mai-n chamv 7 her of the direct-contact condense-r through 7 0 the nozzles n. 'The second stage ejector draws the air from the'top end of the chamber 6 and discharges it into the end chamber r'o f the surface condenser s; u The cooling or condensing water for the condenser sis the same water as has been employed'for the same purpose in the coni denser 'f, the water-being conducted from the one condenser to the other bylw'a y of tlie pipe 0. This cooling, water, on discharge from the condenser s (by'the lpipeu), is delivered into the feedsystem. A i The condensate collecting in the-bottom of 85 through the; pipe 2, and either through a trap or througha loop or U pipe, to the main condenser. As regards i the condensate deposited in" the delivery chamber 22 of the condensers, this condensate may (the cham-' ber 41 beinga't atmospheric'pressure) be diseharged, by way offthe pipe y, to the feed tank, or it may be passed backthrough a of the inter-condensers, and, in the event of a multi-stage ejector with more than threestages, the combination inter-condenser arrangement could be employed with one, or more, or all, of the inter-condensers.

Having thus described my invention, what I claim as new'and desire to secure by Letters Patent is l. A multi-stage steam-jet ejector arrangement for use in a steam power plant,

involving a surface-inter-condenser and a direct-contact-inter-condenser, these two in ter-condensers being in series with the surface-inter-condenser nearest to the first stage steam'ljet, the arrangement'being such that the cooling water used in the said sur-' face-inter-condenser is thereafter delivered i into the feed system of the plant. I

:2. A multi-stage steam-jet ejector arrangement for use in a steam power plant,involving a surface-inter-condenser and a directcontact-inter-condenser, these two inter-con- V densers being in series withthe surface-intercondenser nearest to the first-stagesteamjet, the arrangement being such that the cooling water used in the said surface-intercondenser is'thereafter delivered into the feed'system of the plant, and thearrange- 'ment being suchthat the cooling water employed in the said direct contact-intercondenser is condensate from the main convolving asurface-inter-condenser and a direct-contact-1nter condenser, these two 1ntercondensers belng n series with the surfaceinter-condenser nearest to the first-stage steam jet, and a surface condenser for dealing with the steamfrom the last stage, the arrangement being such that the cooling water employed in the said surface-inter-- condenser is thereafter employed as cooling Waterin thesaidsurface condenser for dealing with the steam from the last stage and is then delivered into the feed system of the plant, and the arrangement being such that the cooling water employed inthe said direct-contact-inter-condenser is condensate from the main'condenser'of the plant. 7

6.,A multi-stage steam-jet ejector arran ement for use in a steam power plant, "involvinga surface-inter-condenser and a direct-contact-inter-condenser, these two intercondensers being in series'with the surfaceinter-condenser nearest to the first-stage steam jet and a surface condenser for dealing with'the steam from the last stage, the

arrangement being such that the cooling water employed in the said surface-intercondenser is thereafter employed as cooling water in the said surface condenser for dealing with the steam from thelast stage and isthen delivered into the feed system of the plant, andthe arrangement being such that tlie cooling Water employed in the said di rect-contact-inter-condenser and the said surface-inter-condenser is condensate from the main condenser of the plant which is supplied to the two said inter-condensersin parallel V I hereby sign my name to this specification.

. 1 JAMES SIM.

arrangement being such that the cooling ii water employed in the said direct-contactinter-condenser and the said surface-intercondenser is condensate from the main condenser of the plant which is supplied-to the two said inter condensers in parallel.

4. multi-stage steam-jet ejector arrange-v ment for-use ina steam power plant, in-.

volving a surface-inter-condenser and a direct-contactinter-condenser, these :two intercondensers being in series with the surface- IIItGI-COIlClQIlSGI JDGZLIQSt to. the first stage steam jet, anda surface condenser for dealing with the steam from the last stage, the

1 arrangement being such that the cooling water employed in the said surface-intercondenser is thereafter employed as cooling water in the said surface condenser for dealing with the steam from thelast stage and is then delivered into the feed system of-the plant.

5. A multi-stage steam-jetejector arrangement for use in a steam power plant, in- 

